Chilling Fast vs Slow (flow rate)?

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boondocksaint

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I have a Kal clone set up (3 20 Gal kettles; Electric Control Panel; two Chugger pumps, etc) and use the same CFC chiller recommended on the (www.theelectricbrewery.com) website.

Chilling Post boil: My usual set up is to use my old immersion chiller in a bucket with ice/water and run the water from the sink - through the immersion chiller (in ice water) - then through the CFC - and back to the sink to drain.
The wort is run from the BK through the pump and through the CFC.

My brew buddy and I have been having a disagreement about the flow rate of both the water and wort and which is more efficient. He wants to run the wort much faster and recirc back through the BK; while the water is running full blast. I feel like slowing the wort way down and running it through (once) is the way to go.

I know on the Brew Day Step By Step section, Kal recommends running it through once and straight into the fermentor.
Should the flow rates match? Is there a benefit or potential issues with one over the other (fast vs slow)?

Cheers all!
*If this topic has already been litigated, please feel free to point me in that direction!
 

JohnSand

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I remember a similar thread about immersion chillers. I think the conclusions were mixed. I do believe that the cooling water can go through so fast that it doesn't have time to absorb the heat. With my IC, I slow the flow down as the wort cools, just judging by the feel of the discharged water. If it isn't hot, it isn't working.
 

McMullan

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I find reducing water flow rate increases relative cooling efficiency as the temperature difference between wort and cooling water gets smaller. With both my IC and CFC. It seems to be a very dynamic process and not governed by a single predictable factor. Initially, I'll have the water on full blast. By the end of cooling, it's on a trickle.
 

tripelthelightfantastic

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my pump + IC has a constant flow rate, slowing the flow rate down as the wort gets cooler is a good idea i need to try by restricting the output tube...
While its not related to flow rate, one thing i find gives me a big temp drop is stirring the wort or using the IC to stir the wort and distribute the cold temp from the IC
 

Scout

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I think you are right, if the flow is too fast it won't cool as efficiently. I have a plate chiller and set up the flow so that the wort comes out at or close to pitching temp. I think of it as cooling during the transfer to fermenter. Two birds with one stone kinda thing.
 
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